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56 lines
1.6 KiB
56 lines
1.6 KiB
3 years ago
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2005-2006 Dan Marsden
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_FUSION_CATEGORY_OF_IMPL_20060217_2141)
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#define BOOST_FUSION_CATEGORY_OF_IMPL_20060217_2141
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/support/detail/mpl_iterator_category.hpp>
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#include <boost/mpl/begin_end.hpp>
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#include <boost/mpl/is_sequence.hpp>
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#include <boost/static_assert.hpp>
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namespace boost { namespace fusion {
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namespace detail
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{
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template <typename T>
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struct mpl_sequence_category_of
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{
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// assumes T is an mpl sequence
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// there should be no way this will ever be
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// called where T is an mpl iterator
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BOOST_STATIC_ASSERT(mpl::is_sequence<T>::value);
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typedef typename
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mpl_iterator_category<
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typename mpl::begin<T>::type::category
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>::type
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type;
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};
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}
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struct mpl_sequence_tag;
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namespace extension
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{
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template<typename Tag>
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struct category_of_impl;
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template<>
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struct category_of_impl<mpl_sequence_tag>
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{
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template<typename T>
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struct apply
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: detail::mpl_sequence_category_of<T>
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{};
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};
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}
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}}
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#endif
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